Gravity-Forms-Validation/gravity.php at master · leonmagee/Gravity-Forms-Validation · GitHub

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/* ==========================================================================
   GRAVITY FORMS CUSTOM VALIDATION
   ========================================================================== */

   // filter hook
    add_filter( 'gform_validation_4', 'new_custom_val' );


    // callback function
    function new_custom_val( $val_result ) {

        // get form object
        $form = $val_result['form'];

        // 'rgpost' gets the submitted input - 'input_15' is the input name attribute
        $field_value_1 = rgpost( 'input_15' );

        $field_value_2 = rgpost( 'input_16' );

        if ( $field_value_1 != $field_value_2 ) {


            // [1] denotes the first input field in the 'fields' array
            $form['fields'][1]['failed_validation'] = true;

            $form['fields'][1]['validation_message'] = 'Phone Numbers Must Match';

            $form['fields'][2]['failed_validation'] = true;

            $form['fields'][2]['validation_message'] = 'Phone Numbers Must Match';

            $val_result['is_valid'] = false;
        }

        // add the changes you've made to the form object in the variable you will return
        $val_result['form'] = $form;

        return $val_result;
    }